Wristwatch



FIG. 1 is a top, right, and front perspective view of an ornamental design for a wristwatch according to the present invention;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a bottom plan view thereof.

All portions shown in broken lines are environmental and illustrative only and form no part of the claimed design. 

The ornamental design for a wristwatch, as shown and described. 